[kitcarbp]

Found this on the MSD tech info section of the web-site that talks about EMI.

8. How do I fix:
• A high rpm miss when the engine is under load?
• An rpm limiter that seems to activate at the wrong rpm?
• Erratic operation of electronic devices/ECUs?
• A tachometer needle that seems to “bounce”?
All of the above can be caused by Electro Magnetic Interference (EMI) generated by the ignition system. Specifically through the coil and spark plug wires. The ignition system is a miniature power station and the spark plug wires are its transmission lines. The wires (in particular, “solid core” wires) can broadcast EMI that seeps into electronics and causes erratic behavior.

To combat EMI you need to run a set of helically wound spark plug wires such as MSD’s Heli-Core or 8.5mm Super Conductor Wires. Having the conductor wound around a special center core produces a “choke” that holds EMI inside the wire. Solid core wires on the other hand, have no suppression capabilities and should not be used with an MSD Ignition. MSD’s Super Conductor Wires have extremely low resistance (less than 50 ohms per foot), yet are designed to suppress EMI like a high resistance wire.